...just put another 100MHz on Nb (from 2GHz, to 2.1GHz more not needed) & you'll pass 3.6GHz bariere with no problem, till 3.8-3.9GHz, just watch for VCore, couse you'll need to increase it too, also on NB...

...better solution is OCz Vendetta 2 if you can fit it in your case...
& if your temp's under load are now under 50'C then it's ok to OC it a little bit more

My CPU runs under CM Hyper TX2 with 35'C idle non OC, when OC to 3.8GHz it goes to 58'C+ on load, & 62'C is max for that package...

Be avare that sometimes temps shown by programs are not correct, you better try it with hand, if there stands that CPU is at 45-50'C you should be able to touch cooler on CPU, becouse cooler is not so hot as CPU, ...if it isn't hot at all, you better consider changing thermal paste between CPU & cooler, & if it's too hot, better not force it much...

Make good ventialtion in case, more exhaust fans then intake, so it makes negative pressure, it's much better cooling then, see on internet...

you can get stable 3.5 or 3.6 ghz without incresing voltage and getting too high temperature with this processor, if you want to go above that then you should buy a cooler.

i suggest pentagram karakorum, its cheep and you wont get more degrees than 45 ( in Celcius ) even if you increse the voltage above maximum, my min idle temp is 28 and max stress is 45 and i overclocked my phenom II to 3.8ghz with 1.488 voltage, thats how it looks like in my PC.

as you can see its big, so before you get any cooling, make sure it will fit into your case ;p